Occurrence of sialidase activity in two distinct and highly homogeneous populations of lysosomes prepared from the brain of developing mouse

Amelia Fiorilli, Carola Siniscalco, Anna Chiarini, Lucia Di Francesco, Bruno Venerando, Guido Tettamanti

Research output: Contribution to journalArticlepeer-review

Abstract

Light and heavy lysosomes of mouse forebrain were separated from each other by centrifugation on a Percoll gradient. Light lysosomes were then freed from mitochondria and membranes by sucrose density gradient centrifugation and further purified by floatation-centrifugation on a sucrose gradient. The final preparations of light and heavy lysosomes, fairly homogenous, carried sinlidase activity, assayed on MU-NeuAc. The optimal pH was 4.0 and 4.2, the apparent Km value 2.8 × 10-3 M and 4.2 × 10-3 M and the apparent Vmax value 0.11 and 0.47 mU mg-1 protein, for the light and heavy lysosome sialidase, respectively. From 4 days to adulthood the specific activity of the light and heavy lysosome sialidase increased 3-fold and 1.7-fold, respectively.

Original languageEnglish
Pages (from-to)235-238
Number of pages4
JournalFEBS Letters
Volume282
Issue number2
DOIs
Publication statusPublished - May 6 1991

Keywords

  • Brain development
  • Lysosome
  • Sialidase
  • Subcellular fractionation.

ASJC Scopus subject areas

  • Biochemistry
  • Biophysics
  • Molecular Biology

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